c: use Py_REFCNT()

clin1234 · indygreg · commit 7d7ff179e9a3 · 2025-08-23T15:12:48.000-07:00
Closes #275. Closes #201.
diff --git a/c-ext/backend_c.c b/c-ext/backend_c.c
@@ -313,7 +313,7 @@ size_t roundpow2(size_t i) {
 int safe_pybytes_resize(PyObject **obj, Py_ssize_t size) {
     PyObject *tmp;
 
-    if ((*obj)->ob_refcnt == 1) {
+    if (Py_REFCNT(*obj) == 1) {
         return _PyBytes_Resize(obj, size);
     }
 
diff --git a/docs/news.rst b/docs/news.rst
@@ -8,6 +8,8 @@ Version History
 =========================
 
 * PyO3 Rust created upgraded from 0.24 to 0.25. (#273)
+* We now use `Py_REFCNT(obj)` instead of accessing `(*obj)->ob_refcnt` directly.
+  This fixes a nogil / multi-threaded compile error. (#201, #275)
 
 0.24.0 (released 2025-08-17)
 ============================

Original file line number	Diff line number	Diff line change
`@@ -313,7 +313,7 @@ size_t roundpow2(size_t i) {`
`313`	`313`	`int safe_pybytes_resize(PyObject **obj, Py_ssize_t size) {`
`314`	`314`	`PyObject *tmp;`
`315`	`315`
`316`		`- if ((*obj)->ob_refcnt == 1) {`
	`316`	`+ if (Py_REFCNT(*obj) == 1) {`
`317`	`317`	`return _PyBytes_Resize(obj, size);`
`318`	`318`	`}`
`319`	`319`